bug#7355: coreutils df on OSX reports wrong sizes for large filesystems

[Tim Spriggs]

2010/11/8 Pádraig Brady <address@hidden>:
> On 08/11/10 20:37, Tim Spriggs wrote:
>> Hello,
>>
>>   I am running gentoo-prefix on OSX which builds coreutils. When I
>> compare the output of the system df to the standard GNU df I get:
>>
>>
>> $ /bin/df -h /data/hirise06
>> Filesystem               Size   Used  Avail Capacity  Mounted on
>> hiserve2:/vol/hirise06  7.9Ti  430Gi  7.5Ti     6%    /data/hirise06
>>
>> $ df -h /data/hirise06
>> Filesystem            Size  Used Avail Use% Mounted on
>> hiserve2:/vol/hirise06
>>                       2.0T  431G -523G   -  /data/hirise06
>>
>> The 2.0T size looks suspicious to me. Maybe an integer is overflowing 
>> somewhere?
>
> Well 2T is between 32 bit and 64 bit.
> If I had to guess I'd say df was using a 32 bit statfs
> that was returning 1024 blksize?
>
> Could you compare the system calls made by both versions of df.
> On GNU/Linux I can trace the statfs calls like:
>
> strace -v -e statfs,statfs64 df /data/hirise06
>
> If the trace for the above gives no output
> for either command, then can you include the
> full trace output.
>
> thanks,
> Pádraig.
>

I ran:

# dtruss -c -f /opt/prefix/bin/df /data/hirise06


CALL                                        COUNT
exit                                            1
fcntl_nocancel                                  1
fstatfs64                                       1
getgid                                          1
gethostuuid                                     1
getrlimit                                       1
kqueue                                          1
shared_region_check_np                          1
shm_open                                        1
statfs64                                        1
workq_open                                      1
bsdthread_register                              2
fcntl                                           2
getdirentries64                                 2
getfsstat64                                     2
getpid                                          2
ioctl                                           2
lseek                                           2
madvise                                         2
thread_selfid                                   3
write_nocancel                                  3
issetugid                                       4
pread                                           4
getegid                                         7
read                                            7
workq_kernreturn                                9
close                                          10
open                                           10
kevent                                         11
munmap                                         11
open_nocancel                                  12
close_nocancel                                 13
fstat64                                        13
read_nocancel                                  15
__sysctl                                       19
getuid                                         19
geteuid                                        27
mmap                                           30
stat64                                         38

and similarly:

# dtruss -c -f /bin/df /data/hirise06

CALL                                        COUNT
bsdthread_register                              1
exit                                            1
fcntl                                           1
fstat64                                         1
geteuid                                         1
getrlimit                                       1
issetugid                                       1
shared_region_check_np                          1
statfs64                                        1
thread_selfid                                   1
getfsstat64                                     2
getpid                                          2
ioctl                                           2
madvise                                         2
write_nocancel                                  2
close                                           3
close_nocancel                                  3
open                                            3
open_nocancel                                   3
read_nocancel                                   3
pread                                           4
munmap                                          5
stat64                                          6
__sysctl                                       15
mmap                                           16